Subj : DAY2SVR: Nws Storm Prediction Center Norman Ok
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Fri Oct 20 2023 05:11:38

ACUS02 KWNS 200511
SWODY2
SPC AC 200510

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1210 AM CDT Fri Oct 20 2023

Valid 211200Z - 221200Z

....NO SEVERE THUNDERSTORM AREAS FORECAST...

....SUMMARY...
Severe thunderstorms are not expected across the continental US on
Saturday.

....Synopsis...

A large-scale upper trough will shift east across the Mid-Atlantic
and Northeast on Saturday. in the wake of this initial trough, a
secondary upper shortwave trough will move across the Midwest into
the Northeast. A surface low near coastal MA will allow for
sufficient boundary-layer moisture while cooling aloft aids in weak
destabilization. A few lighting flashes are possible in the vicinity
of eastern MA, though severe storms are not expected. The secondary
shortwave later in the period will bring a reinforcing dry
continental airmass across the eastern third of the CONUS, with
stable condition precluding additional thunderstorm activity.

Across the western U.S., a mean upper ridge will develop east,
enveloping much of the western two-thirds of the CONUS. Dry and
stable conditions beneath the upper ridge will preclude thunderstorm
potential west of the MS River, despite a weak shortwave impulse
migrating through the ridge over the Four Corners/Central Rockies
vicinity.

...Leitman.. 10/20/2023

$$

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